Title:
An image pick-up optical system, a camera device, and a personal digital assistant unit
Document Type and Number:
Japanese Patent JP6025048
Kind Code:
B2
Abstract:
An imaging optical system, includes: in the order from an object side to an image plane side, a first lens group (G1) having a first lens (L1) which is formed as a negative lens; a second lens group (G2) having a second lens (L2) which is formed as a plano-concave lens, a third lens (L3) which is formed as a negative meniscus lens, and a fourth lens (L4) which is formed as a biconvex lens; an aperture stop (S); a third lens group (G3) having a fifth lens (L5) which is formed as a biconvex lens, and a sixth lens (L6) which is formed as a biconcave lens; and a fourth lens group (G6) having a seventh lens (L7) which is formed as a negative meniscus lens.
Inventors:
Takahiro Nakayama
Application Number:
JP2012285931A
Publication Date:
November 16, 2016
Filing Date:
December 27, 2012
Export Citation:
Assignee:
株式会社リコー
International Classes:
G02B13/00; G02B13/18
Domestic Patent References:
| JP2012008347A | ||||
| JP45001584B1 | ||||
| JP43029409B1 | ||||
| JP2014059466A |
Attorney, Agent or Firm:
Shuji Sanada
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